Maxim MAX31915 Octal Digital Input Translator translates and conditions the 24V digital output of sensors and switches used in industrial, process, and building automation. These output signals are converted into 5V CMOS compatible signals required by microcontrollers. It provides the frontend interface circuit of a programmable logic controller (PLC) digital input module. The signal voltage translation is performed in conjunction with input current limiting and lowpass filtering. Input current-limiting allows a significant reduction in power consumed from the field-supply voltage, as compared to traditional discrete resistor-divider implementations. Selectable on-chip lowpass filters allow flexible debouncing and filtering of sensor inputs based on the application. When no filtering is selected, the IC is capable of detecting pulses as short as 0.75µs at its field inputs.